Bishara S E, Chu G W, Jakobsen J R
Department of Orthodontics, College of Dentistry, University of Iowa, Iowa City.
Am J Orthod Dentofacial Orthop. 1988 Sep;94(3):184-200. doi: 10.1016/0889-5406(88)90027-3.
The purpose of this study was to determine retrospectively the stability of the LeFort I osteotomy after one-piece maxillary impaction and wire fixation. Cephalograms of 31 patients were evaluated before surgery, immediately after surgery, in fixation, and postfixation. All subjects had characteristics of excessive vertical maxillary growth. Descriptive statistics for the absolute and relative changes of the various linear and angular parameters were calculated for the different stages. The analysis of variance general linear models procedure was used to compare the repeated measures of the total sample. From the present findings, it was concluded that (1) after the initial surgical superior repositioning, the maxilla continued to move superiorly and most of the upward movement occurred during fixation, (2) the anterior part of the maxilla moved superiorly more than twice that of the posterior part of the maxilla, (3) maxillary superior dental movement exceeded maxillary superior skeletal movement, and (4) maxillary horizontal skeletal movement exceeded maxillary horizontal dental movement. The clinical significance of the findings are discussed.
本研究的目的是回顾性地确定整块上颌骨牵引及钢丝固定后LeFort I型截骨术的稳定性。对31例患者的头颅侧位片在手术前、手术后即刻、固定期及固定后期进行评估。所有受试者均有上颌垂直生长过度的特征。计算不同阶段各种线性和角度参数的绝对和相对变化的描述性统计量。采用方差分析的一般线性模型程序比较总样本的重复测量值。根据目前的研究结果得出以下结论：（1）在初次手术向上重新定位后，上颌骨继续向上移动，且大部分向上移动发生在固定期；（2）上颌骨前部向上移动的幅度是上颌骨后部的两倍多；（3）上颌牙齿向上移动超过上颌骨骼向上移动；（4）上颌水平骨骼移动超过上颌水平牙齿移动。并对这些研究结果的临床意义进行了讨论。
